Conveners
Parallel Session PI.8
- Javier Rubio
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Rasmi Muñoz04/06/2024, 16:40
One long-standing tension in the determination of neutrino parameters is the mismatched value of the solar mass square difference, $\Delta m_{21}^2$, measured by different experiments: the reactor antineutrino experiment KamLAND finds a best fit larger than the one obtained with solar neutrino data. Even if the current tension is mild ($\sim 1.5\sigma$), it is timely to explore if independent...
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Nicolás Loayza (IFIC - Universitat de Valéncia - CSIC)04/06/2024, 17:00
We study the energy transfer after inflation from the inflaton ($\phi$) into a scalar field ($\chi$) non-minimally coupled to gravity via $\xi R|\chi|^2$, considering single field inflationary models with potential $\propto |\phi|^{p}$ around $\phi = 0$. This corresponds to the paradigm of geometric preheating, which we extend to its non linear regime by means of lattice simulations. Using...
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Kenneth Marschall04/06/2024, 17:20
We discuss the evolution of the energy distribution and equation of state during the reheating phase. We consider observationally consistent single-field inflation models, with potentials that have monomial shape around the origin and a reheating sector that comprises a massless scalar field, which couples via a trilinear interaction to the inflaton. By investigating the non-linear dynamics of...
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Dr TaeHun Kim (KIAS)04/06/2024, 17:40
A thermal interpretation of the stochastic formalism of a slow-rolling scalar field in a de Sitter (dS) universe is given. We construct a correspondence between causal patches in the 3-dimensional space of a dS universe and particles living in an abstract space. By assuming a dual description of scalar fields and classical mechanics in the abstract space, we show that the stochastic evolution...
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Dr Yong Xu (JGU Mainz)04/06/2024, 18:00
In this talk, I will discuss the inevitable stochastic gravitational wave (GW) spectrum resulting from graviton bremsstrahlung during inflationary reheating. We will focus on an inflaton, denoted as $\phi$, oscillating around a generic monomial potential $V(\phi) \propto \phi^n$, while considering two different reheating scenarios: (i) inflaton decay and (ii) inflaton annihilation. I will...
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Bruno Bucciotti (Scuola Normale Superiore di Pisa)04/06/2024, 18:20
We study the quadratic quasi-normal modes of a Schwarzschild black hole, i.e. those perturbations that originate from the coupling of two (linear) quasi-normal modes.
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Assuming the amplitude of the two linear modes is known, we compute the amplitude of the resulting quadratic mode for a wide range of possible angular momenta. Finally, we reconstruct the waveform in radiation gauge. -
Fabio Briscese04/06/2024, 18:40
Nonlocal field theories allow us to formulate a quantum renormalizable theory of the gravitational field, thanks to an improved ultraviolet convergence of the quantum propagator. In this talk, I will describe the main features of these models, such as renormalizability and quantum unitarity. Additionally, I will discuss some properties of classical solutions of the modified Einstein's equations.
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